Malicious PDF — malware analysis report

Static analysis result for SHA-256 c454af3e59068fca…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 18:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31c118d01e3ebc1d5d4075e2223bf998 SHA-1: 5aa9a5827c6f73592e2bc1d896d7a426876fd2db SHA-256: c454af3e59068fca197982817b4b96190973089c2a72e1171f918bf0db40541b
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It contains embedded JavaScript and presents a deceptive download button, along with instructions for a password-protected archive, strongly suggesting a social engineering attack to trick users into downloading a malicious payload. The presence of external URIs pointing to compromised WordPress upload storage and link farms further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://archerelectricsupply.com/userfiles/file/sulowoxepenetujojetisiz.pdf In PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dizemitubebopefiminisu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/lotuniv.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/18172496015.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/riwapigafamefevirolut.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/gifubivajijanumadulibe.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/kotekuripuwifivuziwudin.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/79313464548.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/lukufoxixudekebepudarut.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/32118693878.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/27g7kqqj520egms0ll8l932etl/49584368221.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d52ec3fb40231ef413939e9f79128e03/gufujosal.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/lozomogoxemanukuzizux.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5ee5324895da4fa1757aa75ddc211f3e/42444498642.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/58716042180.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/14627308324.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/tulujiruvuxukorudorivaju.pdfIn PDF document text
    • https://eventaipei.com/upload/files/11366410610.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/49688986587.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/karapodamoxaz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d152abd3c2---30989082442.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/tomivorenamit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=conversor+de+pdf+para+word+ocrPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 10560 bytes
SHA-256: 325c0076e4a973105fbdfbe7240e097a9dbe5f106e4aa43d9c33ef4f64ca9ef1
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 18704 bytes
SHA-256: b236276a0bda5bb21be7fa81907d4ad17d85ed3477acf343deee5be74dd68c57
font_02_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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